Remove vp8, vp9 folders

configure

examples.mk

libs.mk

test/blockiness_test.cc

test/consistency_test.cc

test/convolve_test.cc

test/dct16x16_test.cc

test/dct32x32_test.cc

test/encode_api_test.cc

test/fdct4x4_test.cc

test/fdct8x8_test.cc

test/idct_test.cc

test/partial_idct_test.cc

test/quantize_test.cc

test/sixtap_predict_test.cc

test/test.mk

test/vp10_convolve_test.cc

test/vp10_inv_txfm_test.cc

test/vp8_fdct4x4_test.cc

test/vp9_error_block_test.cc